Rotatable eraser.



PATENTED MAY 21, 1907.

0. S. PUGERUD.

ROTATABLE BRASER.

APPLIGATION FILED MAY 2, 1906.

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INVENTOR 0h 9. W.

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PATENTED MAY 21, 1907.

No. 858,994. O. S. PUGERUD.

ROTATABLE ERASER.

APPLIGATION FILED MAY 2. 1906.

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"INVENTOR WII'IVESSES:

OLA s. PUGERUD, or NEW YURK, N. Y.

FIOTATABLE ERASER-- Specification of Letters Patent.

Patented May 21, 1907.

Application filed Kay 2, 1906. Serial No. 814,762.

vice for rotating an eraser so that the same i may be readily applied. to material from which lines or other marks are to be erased, to do away with the mechanical rubbing by the hand of the operator.

In carrying out this invention 1 make use of a rotatable shaft which is adapted to be cmmected, preferably by a flexible connection,.with a motor, preferably an electric. mo-

tor, and to carry at one end a rotatable eraser of the ordinary disk type. I prefer to provide the shaft with a. handle element which may carry a cleaning clement abutting upon the eraser to clean it of all smudge or dirt which it may have picked up from the. paper during its rotation. I prefer to resiliently press the cleaning element against the eraser and for this )urpose I prefer that a guide, preferably radial to the shaft and vertical when in use, be provided to guide said cleaning element. I also prefer to provide an adjustable means for regulating the resilient pressure of the cleaning element upon the eraser. I prefer to provide a switch upon the handle element for making connections with the electric circuit which may control the motor. 1

My invention will be set forth in the claims.

In the accompanying drawing, Figure 1 is a side elevation partly in section of my improved device with the motor connections shown diagrammatically Fig. 2 is a plan view of Fig. 1; and Fig. 3 is a section on line ac-w Fig. land Fig. 4. Fig. 4 is a side elevation of a modified device.

' As shown in the drawings, my improved erasing device'consists of a rotatable shaft 2- mounted in a stationary handle. element or sleeve 1, and provided with thrust collars 3, 4, at each end of the sleeve. The ends of the shaft 2 may be of polygonal shape, or otherwise as desired, and an ordinary circular eraser 11 having an open central bushing 12 may be secured to the end 5 of the shaft by friction, if desired. To the opposite end of the shaft I may secure a flexib e connection 15 leading to a motor shaft 16. Above the eraser I mount acleaning element which is pr *ferably of a rubber softer than the eraser. My preferred form for mounting the cleaning element 10 consists of a spring clamp'z'closed on three sides and open on one, and formed at the end of a resilient spring arm 8 which arm is secured at its other end to the sleeve 1. A collar 9 surrounds the spring 8 and sleeve 1 and it may he slid lengthwise thereon to cause more or less of the spring pressure to be exerted upon the periphery of the eraser. I prefer to so shape the spring adjacent to the clamp that it may be guided in a radial guide 6 secured on the sleeve 1, to prevent wabbling or sidewise motion of the cleaning element. To control the rotation of the shaft in a simple,convenient and etlicient manner, I mount upon the handle element two electrical contacts 13 and 14, contact 14 being connected b wire 20 to the source of current supply, wh' e contact 13 carries a switch lever 21 and is connected through the motor to the source of power.

As shown in the modification in Fig. 4, the

stationary sleeve 23 carried on one end of a motor frame 24 in which an armature 225 rotates on a shaft 22 which carries the eraser 11 at one end. A cleaning element 17 in a clamp 7 carried by a spring 8 on guides 6 are arranged as before described. In this instance the spring 8 is secured at 29 to the frame of the motor while a switch 30 on the motor frame "may be adapted for controlling the current supplied to the motor armature 25 and field 26. A threaded stem 28 fast to the motor frame and passing through the spring 8 carries a thumb nut 27 for the purpose of regulating the tension of the spring.

In operation the user grasps the handle element. in one hand with his finger or thumb adjacent to the contact switch 21 and holds it closed, causing the motor to thereby impart motion to the shaft 2 and rapidly rotating the eraser, which may be readily placed upon the line or other matter to be erased, the erasing being done by the rotation of the same. All dirt picked up by the edge of the eraser will be transferred or wiped off by the cleaning element so that a clean erasure can be made. The slight amount of air which is blown by centrifugal force outwardly from the periphery of the eraser will clean all flakes or crumbs of the paper or other material to be erased, from the same.

VVhilo I have shown soft rubber as the cleaning element, any substantially solid plain surfaced erasive element may be substituted which will not smudge the edge of the eraser.

What I claim as my invention is:

1. A rotatable shaft adapted for connection with a motor, a non-rotating handle element, a circular eraser mounted on said ro-.

tatable shaft, and a stationary cleaning element having a substantially solid abrading surface adapted to abut against said eraser, and resilient means for pressing the cleaning element against the eraser.

2. rotatable shaft adapted for connection with a motor, a non-rotating handle element, a circular eraser mounted on said rotatable shaft, and a stationary cleaning element having a substantially solid abrading surface adapted to abut against saideraser, said element composed of soft rubber, and resilient means for pressing the cleaning element against the eraser.

3. A rotatable shaft adapted for connection with a motor, a non-rotating handle element, an eraser mounted on said rotatable shaft, and a stationary cleaning element having a substantially solid abrading surface adapted to abut against said eraser, a guide at that end of the handle adjacent the eraser, a resilient arm in the guide said arm carrying the cleaning element.

4. A rotatable shaft adapted for connection with a motor, a non-rotating handle element, an eraser mounted on said rotatable shaft, and a stationary cleaning element adapted to abut against said eraser, a guide, a resilient arm in the guide said arm carrying the cleaning element, said arm secured to the stationary element and an adjusting collar slidable on the arm and stationary element.

5. A rotatable shaft adapted for connection with a motor, a non-rotating handle element, an eraser mounted on said rotatable shaft, and a stationary cleaning element adapted to abut against said eraser, a guide, a resilient arm in the guide said arm carrying the cleaning element, said arm secured to the mounted, a resilient arm passing through said guide and fast at one end to the sleeve, a clamp at its free end, a cleaning element in said clamp with a portion thereof adapted for engagement with said eraser, and an adjusting collar surrounding said arm and sleeve and slidable thereon.

7. A rotatable shaft adapted for connection with a motor, a rotatable eraser carried at one end thereof, a stationary guide radial to the shaft, a stationary sleeve on which it is mounted, a resilient arm passing through said guide and fast at one end to the sleeve, a clamp at its free end, a cleaning element in said clamp-With a portion thereof adapted for engagement with said eraser, and a switch carying contacts on said sleeve, in combination with adjustable means for changing the pressure on eraser and cleaning element.

Si ed at New York city this day of Apri, 1906.

OLA S. PUGERUD.

Witnesses:

F. WARREN WRIGHT, GRACE LIMIs WRIGHT. 

